It looks like I'm in trouble and need assistance.
The AVR (ATmega-644p) on my desk is connected through TTL>>RS-232 bidirectional adapter to a D_tech USB>>Serial/RS-232 cable to my PC where I use my IDE and other programs to work with AVR. Since many months it has worked just fine. I never had any issues receiving or transmitting bits of data. Since today, its not functioning anymore.
So far, I have tried : - checked in devmgmt.msc for driver issues, no issues.
- changed to another USB>>Serial Cable , same results.
- tried with new AVR MCU, same results.
- I flashed a simple program into AVR which echoes the typed characters back to my PC, does not work.
- if I short the RX-TX at the end of the RS-232>>TTL converter and then type in terminal, in this case it echoes back, if I connect back to AVR and try the same, nothing happens.
- while connected to AVR, if I wave with my hand very close to RS-232>>TTL converter, I see some garbage in terminal. It send garbage if my hand is very close to that adapter, if I remove my hand it stops.
Using avrdude in Windows Console shows that the AVR is initialized and ready to accept instructions. So at least I know that AVR is running properly. I can without any issues program it back and forth.
Right now I have no idea what else should I try to find out whats wrong.
I hope that someone here come across to such a issue.